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<td> <div>Defined in header <code><a href="../header/regex.html" title="cpp/header/regex">&lt;regex&gt;</a></code>
 </div>
</td>
<td></td>
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<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> BidirIt, <br>
<p>          <span class="kw1">class</span> Alloc, <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br>
<span class="kw4">bool</span> regex_match<span class="br0">(</span> BidirIt first, BidirIt last,<br>
                  <a href="match_results.html"><span class="kw1687">std::<span class="me2">match_results</span></span></a><span class="sy1">&lt;</span>BidirIt,Alloc<span class="sy1">&gt;</span><span class="sy3">&amp;</span> m,<br>
                  <span class="kw4">const</span> <a href="basic_regex.html"><span class="kw1679">std::<span class="me2">basic_regex</span></span></a><span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> e,<br>
                  <a href="match_flag_type.html"><span class="kw1717">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_flag_type</span></span></a> flags <span class="sy1">=</span> <br>
</p>
                      <a href="match_flag_type.html"><span class="kw1718">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_default</span></span></a> <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td> (1) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> BidirIt, <br>
<p>          <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br>
<span class="kw4">bool</span> regex_match<span class="br0">(</span> BidirIt first, BidirIt last,<br>
                  <span class="kw4">const</span> <a href="basic_regex.html"><span class="kw1679">std::<span class="me2">basic_regex</span></span></a><span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> e,<br>
                  <a href="match_flag_type.html"><span class="kw1717">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_flag_type</span></span></a> flags <span class="sy1">=</span> <br>
</p>
                      <a href="match_flag_type.html"><span class="kw1718">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_default</span></span></a> <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Alloc, <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br>
<p><span class="kw4">bool</span> regex_match<span class="br0">(</span> <span class="kw4">const</span> CharT<span class="sy2">*</span> str,<br>
                  <a href="match_results.html"><span class="kw1687">std::<span class="me2">match_results</span></span></a><span class="sy1">&lt;</span><span class="kw4">const</span> CharT<span class="sy2">*</span>,Alloc<span class="sy1">&gt;</span><span class="sy3">&amp;</span> m,<br>
                  <span class="kw4">const</span> <a href="basic_regex.html"><span class="kw1679">std::<span class="me2">basic_regex</span></span></a><span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> e,<br>
                  <a href="match_flag_type.html"><span class="kw1717">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_flag_type</span></span></a> flags <span class="sy1">=</span> <br>
</p>
                      <a href="match_flag_type.html"><span class="kw1718">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_default</span></span></a> <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td> (3) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> STraits, <span class="kw1">class</span> SAlloc, <br>
<p>          <span class="kw1">class</span> Alloc, <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br>
<span class="kw4">bool</span> regex_match<span class="br0">(</span> <span class="kw4">const</span> <a href="../string/basic_string.html"><span class="kw1043">std::<span class="me2">basic_string</span></span></a><span class="sy1">&lt;</span>CharT,STraits,SAlloc<span class="sy1">&gt;</span><span class="sy3">&amp;</span> s,<br>
                  <a href="match_results.html"><span class="kw1687">std::<span class="me2">match_results</span></span></a><span class="sy1">&lt;</span><br>
                      <span class="kw1">typename</span> <a href="../string/basic_string.html"><span class="kw1043">std::<span class="me2">basic_string</span></span></a><span class="sy1">&lt;</span>CharT,STraits,SAlloc<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">const_iterator</span>,<br>
                      Alloc<br>
                  <span class="sy1">&gt;</span><span class="sy3">&amp;</span> m,<br>
                  <span class="kw4">const</span> <a href="basic_regex.html"><span class="kw1679">std::<span class="me2">basic_regex</span></span></a><span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> e,<br>
                  <a href="match_flag_type.html"><span class="kw1717">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_flag_type</span></span></a> flags <span class="sy1">=</span> <br>
</p>
                      <a href="match_flag_type.html"><span class="kw1718">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_default</span></span></a> <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td> (4) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
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<td></td>
<td></td>
<td></td>
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<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br>
<p><span class="kw4">bool</span> regex_match<span class="br0">(</span> <span class="kw4">const</span> CharT<span class="sy2">*</span> str,<br>
                  <span class="kw4">const</span> <a href="basic_regex.html"><span class="kw1679">std::<span class="me2">basic_regex</span></span></a><span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> e,<br>
                  <a href="match_flag_type.html"><span class="kw1717">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_flag_type</span></span></a> flags <span class="sy1">=</span> <br>
</p>
                      <a href="match_flag_type.html"><span class="kw1718">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_default</span></span></a> <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td> (5) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
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<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> STraits, <span class="kw1">class</span> SAlloc, <br>
<p>          <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br>
<span class="kw4">bool</span> regex_match<span class="br0">(</span> <span class="kw4">const</span> <a href="../string/basic_string.html"><span class="kw1043">std::<span class="me2">basic_string</span></span></a><span class="sy1">&lt;</span>CharT, STraits, SAlloc<span class="sy1">&gt;</span><span class="sy3">&amp;</span> s,<br>
                  <span class="kw4">const</span> <a href="basic_regex.html"><span class="kw1679">std::<span class="me2">basic_regex</span></span></a><span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> e,<br>
                  <a href="match_flag_type.html"><span class="kw1717">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_flag_type</span></span></a> flags <span class="sy1">=</span> <br>
</p>
                      <a href="match_flag_type.html"><span class="kw1718">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_default</span></span></a> <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td> (6) </td>
<td> <span class="t-mark-rev t-since-cxx11">(since C++11)</span> </td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
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<tr class="t-dcl t-since-cxx14">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> STraits, <span class="kw1">class</span> SAlloc, <br>
<p>          <span class="kw1">class</span> Alloc, <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">&gt;</span><br>
<span class="kw4">bool</span> regex_match<span class="br0">(</span> <span class="kw4">const</span> <a href="../string/basic_string.html"><span class="kw1043">std::<span class="me2">basic_string</span></span></a><span class="sy1">&lt;</span>CharT,STraits,SAlloc<span class="sy1">&gt;</span><span class="sy3">&amp;&amp;</span>,<br>
                  <a href="match_results.html"><span class="kw1687">std::<span class="me2">match_results</span></span></a><span class="sy1">&lt;</span><br>
                      <span class="kw1">typename</span> <a href="../string/basic_string.html"><span class="kw1043">std::<span class="me2">basic_string</span></span></a><span class="sy1">&lt;</span>CharT,STraits,SAlloc<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">const_iterator</span>,<br>
                      Alloc<br>
                  <span class="sy1">&gt;</span><span class="sy3">&amp;</span>,<br>
                  <span class="kw4">const</span> <a href="basic_regex.html"><span class="kw1679">std::<span class="me2">basic_regex</span></span></a><span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span>,<br>
                  <a href="match_flag_type.html"><span class="kw1717">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_flag_type</span></span></a> flags <span class="sy1">=</span> <br>
</p>
                      <a href="match_flag_type.html"><span class="kw1718">std::<span class="me2">regex_constants</span><span class="sy4">::</span><span class="me2">match_default</span></span></a> <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
</td>
<td> (7) </td>
<td> <span class="t-mark-rev t-since-cxx14">(since C++14)</span> </td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
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<p>Determines if the regular expression <code>el</code> matches the given target. 
</p>
<div class="t-li1">
<span class="t-li">1)</span> Determines if there is a match between the regular expression <code>e</code> and the entire target character sequence <code>[first,last)</code>, taking into account the effect of <code>flags</code>. Match results are returned in <code>m</code>.</div>
<div class="t-li1">
<span class="t-li">2)</span> Behaves as (1) above, omitting the match results.</div>
<div class="t-li1">
<span class="t-li">3)</span> Returns <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">regex_match</span><span class="br0">(</span>str, str <span class="sy2">+</span> <a href="../string/char_traits.html"><span class="kw1064">std::<span class="me2">char_traits</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">length</span><span class="br0">(</span>str<span class="br0">)</span>, m, e, flags<span class="br0">)</span></span></span>.</div>
<div class="t-li1">
<span class="t-li">4)</span> Returns <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">regex_match</span><span class="br0">(</span>s.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, s.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, m, e, flags<span class="br0">)</span></span></span>.</div>
<div class="t-li1">
<span class="t-li">5)</span> Returns <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">regex_match</span><span class="br0">(</span>str, str <span class="sy2">+</span> <a href="../string/char_traits.html"><span class="kw1064">std::<span class="me2">char_traits</span></span></a><span class="sy1">&lt;</span>charT<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">length</span><span class="br0">(</span>str<span class="br0">)</span>, e, flags<span class="br0">)</span></span></span>.</div>
<div class="t-li1">
<span class="t-li">6)</span> Returns <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">regex_match</span><span class="br0">(</span>s.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span>, s.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span>, e, flags<span class="br0">)</span></span></span>.</div>
<div class="t-li1">
<span class="t-li">7)</span> The overload 4 is prohibited from accepting temporary strings, otherwise this function populates match_results m with string iterators that become invalid immediately.</div>
<p>Note that <code>regex_match</code> will only successfully match a regular expression to an <i>entire</i> character sequence, whereas <span class="t-lc"><a href="regex_search.html" title="cpp/regex/regex search">std::regex_search</a></span> will successfully match subsequences.
</p>
<table id="toc" class="toc"><tr><td>
<div id="toctitle"><h2>Contents</h2></div>
<ul>
<li class="toclevel-1 tocsection-1"><a href="regex_match.html%23Parameters"><span class="tocnumber">1</span> <span class="toctext">Parameters</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="regex_match.html%23Return_value"><span class="tocnumber">2</span> <span class="toctext">Return value</span></a></li>
<li class="toclevel-1 tocsection-3"><a href="regex_match.html%23Example"><span class="tocnumber">3</span> <span class="toctext">Example</span></a></li>
<li class="toclevel-1 tocsection-4"><a href="regex_match.html%23See_also"><span class="tocnumber">4</span> <span class="toctext">See also</span></a></li>
</ul>
</td></tr></table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Parameters">edit</a>]</span> <span class="mw-headline" id="Parameters">Parameters</span>
</h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  first, last
</td>
<td> -
</td>
<td>  the target character range to apply the regex to, given as iterators
</td>
</tr>
<tr class="t-par">
<td>  m
</td>
<td> -
</td>
<td>  the match results
</td>
</tr>
<tr class="t-par">
<td>  str
</td>
<td> -
</td>
<td>  the target string, given as a null-terminated C-style string
</td>
</tr>
<tr class="t-par">
<td>  s
</td>
<td> -
</td>
<td>  the target string, given as a <span class="t-lc"><a href="../string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span>
</td>
</tr>
<tr class="t-par">
<td>  e
</td>
<td> -
</td>
<td>  the regular expression
</td>
</tr>
<tr class="t-par">
<td>  flags
</td>
<td> -
</td>
<td>  flags used to determine how the match will be performed
</td>
</tr>
<tr class="t-par-hitem">
<td colspan="3"> Type requirements
</td>
</tr>
<tr class="t-par-req">
<td colspan="3"> -<div class="spacer"></div>
<code>BidirIt</code> must meet the requirements of <a href="../concept/BidirectionalIterator.html" title="cpp/concept/BidirectionalIterator"><code>BidirectionalIterator</code></a>.
</td>
</tr>
</table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Return value">edit</a>]</span> <span class="mw-headline" id="Return_value">Return value</span>
</h3>
<p>Returns <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> if a match exists, <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> otherwise. In either case, the object <code>m</code> is updated, as follows:
</p>
<p>If the match does not exist:
</p>
<table class="t-dsc-begin">

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td colspan="2">  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">ready</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="kw2">true</span></span></span>
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td colspan="2">  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">empty</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="kw2">true</span></span></span>
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td colspan="2">  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">0</span></span></span>
</td>
</tr>

</table>
<p>If the match exists:
</p>
<table class="t-dsc-begin">

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">ready</span><span class="br0">(</span><span class="br0">)</span></span></span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span>
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">empty</span><span class="br0">(</span><span class="br0">)</span></span></span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span>
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span>
</td>
<td>  number of subexpressions plus 1, that is, <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="nu0">1</span><span class="sy2">+</span>e.<span class="me1">mark_count</span><span class="br0">(</span><span class="br0">)</span></span></span>
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">prefix</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">first</span></span></span>
</td>
<td>  <code>first</code>
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">prefix</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">second</span></span></span>
</td>
<td>  <code>first</code>
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">prefix</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">matched</span></span></span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> (the match prefix is empty)
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">suffix</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">first</span></span></span>
</td>
<td>  <code>last</code>
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">suffix</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">second</span></span></span>
</td>
<td>  <code>last</code>
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">suffix</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">matched</span></span></span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> (the match suffix is empty)
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>.<span class="me1">first</span></span></span>
</td>
<td>  <code>first</code>
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>.<span class="me1">second</span></span></span>
</td>
<td>  <code>last</code>
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>.<span class="me1">matched</span></span></span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> (the entire sequence is matched)
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m<span class="br0">[</span>n<span class="br0">]</span>.<span class="me1">first</span></span></span>
</td>
<td>  the start of the sequence that matched sub-expression n, or <code>last</code> if the subexpression did not participate in the match
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m<span class="br0">[</span>n<span class="br0">]</span>.<span class="me1">second</span></span></span>
</td>
<td>  the end of the sequence that matched sub-expression n, or <code>last</code> if the subexpression did not participate in the match
</td>
</tr>


<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp">m<span class="br0">[</span>n<span class="br0">]</span>.<span class="me1">matched</span></span></span>
</td>
<td>  <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> if sub-expression n participated in the match, <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> otherwise
</td>
</tr>

</table>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span>
</h3>
<div class="t-example">
<div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;regex&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="co1">// Simple regular expression matching</span>
    <a href="../string/basic_string.html"><span class="kw1045">std::<span class="me2">string</span></span></a> fnames<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> <span class="br0">{</span><span class="st0">"foo.txt"</span>, <span class="st0">"bar.txt"</span>, <span class="st0">"baz.dat"</span>, <span class="st0">"zoidberg"</span><span class="br0">}</span><span class="sy4">;</span>
    <a href="basic_regex.html"><span class="kw1680">std::<span class="me2">regex</span></span></a> txt_regex<span class="br0">(</span><span class="st0">"[a-z]+<span class="es1">\\</span>.txt"</span><span class="br0">)</span><span class="sy4">;</span>
 
    <span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span> <span class="sy3">&amp;</span>fname <span class="sy4">:</span> fnames<span class="br0">)</span> <span class="br0">{</span>
        <a href="../io/basic_ostream.html"><span class="kw1439">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> fname <span class="sy1">&lt;&lt;</span> <span class="st0">": "</span> <span class="sy1">&lt;&lt;</span> std<span class="sy4">::</span><span class="me2">regex_match</span><span class="br0">(</span>fname, txt_regex<span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
    <span class="br0">}</span>   
 
    <span class="co1">// Extraction of a sub-match</span>
    <a href="basic_regex.html"><span class="kw1680">std::<span class="me2">regex</span></span></a> base_regex<span class="br0">(</span><span class="st0">"([a-z]+)<span class="es1">\\</span>.txt"</span><span class="br0">)</span><span class="sy4">;</span>
    <a href="match_results.html"><span class="kw1690">std::<span class="me2">smatch</span></span></a> base_match<span class="sy4">;</span>
 
    <span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span> <span class="sy3">&amp;</span>fname <span class="sy4">:</span> fnames<span class="br0">)</span> <span class="br0">{</span>
        <span class="kw1">if</span> <span class="br0">(</span>std<span class="sy4">::</span><span class="me2">regex_match</span><span class="br0">(</span>fname, base_match, base_regex<span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
            <span class="co1">// The first sub_match is the whole string; the next</span>
            <span class="co1">// sub_match is the first parenthesized expression.</span>
            <span class="kw1">if</span> <span class="br0">(</span>base_match.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> <span class="nu0">2</span><span class="br0">)</span> <span class="br0">{</span>
                <a href="sub_match.html"><span class="kw1685">std::<span class="me2">ssub_match</span></span></a> base_sub_match <span class="sy1">=</span> base_match<span class="br0">[</span><span class="nu0">1</span><span class="br0">]</span><span class="sy4">;</span>
                <a href="../string/basic_string.html"><span class="kw1045">std::<span class="me2">string</span></span></a> base <span class="sy1">=</span> base_sub_match.<span class="me1">str</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
                <a href="../io/basic_ostream.html"><span class="kw1439">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> fname <span class="sy1">&lt;&lt;</span> <span class="st0">" has a base of "</span> <span class="sy1">&lt;&lt;</span> base <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
            <span class="br0">}</span>
        <span class="br0">}</span>
    <span class="br0">}</span>
 
    <span class="co1">// Extraction of several sub-matches</span>
    <a href="basic_regex.html"><span class="kw1680">std::<span class="me2">regex</span></span></a> pieces_regex<span class="br0">(</span><span class="st0">"([a-z]+)<span class="es1">\\</span>.([a-z]+)"</span><span class="br0">)</span><span class="sy4">;</span>
    <a href="match_results.html"><span class="kw1690">std::<span class="me2">smatch</span></span></a> pieces_match<span class="sy4">;</span>
 
    <span class="kw1">for</span> <span class="br0">(</span><span class="kw4">const</span> <span class="kw4">auto</span> <span class="sy3">&amp;</span>fname <span class="sy4">:</span> fnames<span class="br0">)</span> <span class="br0">{</span>
        <span class="kw1">if</span> <span class="br0">(</span>std<span class="sy4">::</span><span class="me2">regex_match</span><span class="br0">(</span>fname, pieces_match, pieces_regex<span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
            <a href="../io/basic_ostream.html"><span class="kw1439">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> fname <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
            <span class="kw1">for</span> <span class="br0">(</span>size_t i <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> i <span class="sy1">&lt;</span> pieces_match.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span> <span class="br0">{</span>
                <a href="sub_match.html"><span class="kw1685">std::<span class="me2">ssub_match</span></span></a> sub_match <span class="sy1">=</span> pieces_match<span class="br0">[</span>i<span class="br0">]</span><span class="sy4">;</span>
                <a href="../string/basic_string.html"><span class="kw1045">std::<span class="me2">string</span></span></a> piece <span class="sy1">=</span> sub_match.<span class="me1">str</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
                <a href="../io/basic_ostream.html"><span class="kw1439">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"  submatch "</span> <span class="sy1">&lt;&lt;</span> i <span class="sy1">&lt;&lt;</span> <span class="st0">": "</span> <span class="sy1">&lt;&lt;</span> piece <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
            <span class="br0">}</span>   
        <span class="br0">}</span>   
    <span class="br0">}</span>   
<span class="br0">}</span></pre></div></div>
<p>Output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">foo.txt: 1
bar.txt: 1
baz.dat: 0
zoidberg: 0
foo.txt has a base of foo
bar.txt has a base of bar
foo.txt
  submatch 0: foo.txt
  submatch 1: foo
  submatch 2: txt
bar.txt
  submatch 0: bar.txt
  submatch 1: bar
  submatch 2: txt
baz.dat
  submatch 0: baz.dat
  submatch 1: baz
  submatch 2: dat</pre></div></div> 
</div>
<h3>
<span class="editsection">[<a href="http%3A//en.cppreference.com/mwiki/index.php" title="Edit section: See also">edit</a>]</span> <span class="mw-headline" id="See_also">See also</span>
</h3>
<table class="t-dsc-begin">

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="basic_regex.html" title="cpp/regex/basic regex"> <span class="t-lines"><span>basic_regex</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>   regular expression object  <br> <span class="t-mark">(class template)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="match_results.html" title="cpp/regex/match results"> <span class="t-lines"><span>match_results</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>   identifies one regular expression match, including all sub-expression matches  <br> <span class="t-mark">(class template)</span> 
</td>
</tr>

<tr class="t-dsc-sep">
<td colspan="2">
</td>
</tr>
<tr class="t-dsc">
<td>  <div class="t-dsc-member-div">
<div><a href="regex_search.html" title="cpp/regex/regex search"> <span class="t-lines"><span>regex_search</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
</div>
</td>
<td>   attempts to match a regular expression to any part of a character sequence  <br> <span class="t-mark">(function template)</span> 
</td>
</tr>
</table>

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